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Just how adaptable it can be, depending on environment. I remember a NatGeo documentary about the Sherpas of Mt. Everest (among other groups) and how their lungs changed over time to take in all the oxygen it can at high altitudes. Helps them function up there and if they came down to sea level, it gives them an advantage in endurance sports and activities.
Another documentary talked about free diving fishermen in New Guinea who, over time, developed large spleens on much the same proportion as a whales and dolphins. It made those fishermen biologically suited for the job.
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"I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past, I will turn the inner eye to see its path.
Where the fear has gone there will be nothing. Only I will remain."
-Litany Against Fear (Dune)
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